feat(react): base structure for floating buttons

apps/client/src/widgets/FloatingButtons.css

@@ -0,0 +1,94 @@
+/* #region Generic floating buttons styles */
+.floating-buttons {
+    position: relative;
+}
+
+.floating-buttons-children,
+.show-floating-buttons {
+    position: absolute;
+    top: 10px;
+    right: 10px;
+    display: flex;
+    flex-direction: row;
+    z-index: 100;
+}
+
+.note-split.rtl .floating-buttons-children,
+.note-split.rtl .show-floating-buttons {
+    right: unset;
+    left: 10px;
+}
+
+.note-split.rtl .close-floating-buttons {
+    order: -1;
+}
+
+.note-split.rtl .close-floating-buttons,
+.note-split.rtl .show-floating-buttons {
+    transform: rotate(180deg);
+}
+
+.type-canvas .floating-buttons-children {
+    top: 70px;
+}
+
+.type-canvas .floating-buttons-children > * {
+    --border-radius: 0; /* Overridden by themes */
+}
+
+.floating-buttons-children > *:not(.hidden-int):not(.no-content-hidden) {
+    margin: 2px;
+}
+
+.floating-buttons-children > *:not(.has-overflow) {
+    overflow: hidden;
+}
+
+.floating-buttons-children > button, .floating-buttons-children .floating-button {
+    font-size: 150%;
+    padding: 5px 10px 4px 10px;
+    width: 40px;
+    cursor: pointer;
+    color: var(--button-text-color);
+    background: var(--button-background-color);
+    border-radius: var(--button-border-radius);
+    border: 1px solid transparent;
+    display: flex;
+    justify-content: space-around;
+}
+
+.floating-buttons-children > button:hover, .floating-buttons-children .floating-button:hover {
+    text-decoration: none;
+    border-color: var(--button-border-color);
+}
+
+.floating-buttons .floating-buttons-children.temporarily-hidden {
+    display: none;
+}
+/* #endregion */
+
+/* #region Show floating button */
+.floating-buttons-children.temporarily-hidden+.show-floating-buttons {
+    display: block;
+}
+
+.floating-buttons-children:not(.temporarily-hidden)+.show-floating-buttons {
+    display: none;
+}
+
+.show-floating-buttons {
+    /* display: none;*/
+    margin-left: 5px !important;
+}
+
+.show-floating-buttons-button {
+    border: 1px solid transparent;
+    color: var(--button-text-color);
+    padding: 6px;
+    border-radius: 100px;
+}
+
+.show-floating-buttons-button:hover {
+    border: 1px solid var(--button-border-color);
+}
+/* #endregion */